Kabul, Dec 13 (DPA) At least four police officers and two civilians were killed Tuesday in a suicide bombing at the governor's compound in the restive southern province of Helmand, a general said.

Eight police officers were injured in the bombing in the provincial capital, Lashkar Gah, General Mohammad Nabi Mullahkhail said.

Governor Mohammed Daoud was not injured in the attack, provincial government spokesman Haji Mohayoddin said.

The bomber had placed explosives on his body and was killed in the explosion, the spokesman said.

Afghanistan has seen more than 100 suicide bombings this year, a record number.

In the eastern province of Khost, four suspected militants and an Afghan girl were killed Tuesday when Afghan and coalition troops returned fire during an arrest raid, the US-led coalition said.

The raid targeted a compound near the village of Darnami. Upon its arrival, the Afghan-coalition force requested that the occupants surrender but they began firing instead, the coalition said.

As a result, four men in the compound and a 13-year-old girl were killed and an eight-year-old girl was wounded, it said. The injured girl was taken to a coalition hospital.

Colonel Thomas Collins, a coalition spokesman, said the coalition had information indicating that the compound was a refuge for terrorists.

No Afghan or coalition forces suffered casualties in the operation, the coalition said.

More than 3,900 people, including 1,000 civilians, have been killed in militant-related incidents this year in Afghanistan, four times greater than in 2005.